Over the last few weeks you've seen us talk a lot about mobile on this blog. Many of you have asked us "why now?" Our answer is, simply, "if not now, then when?" Mobile usage is projected to overtake desktop usage by the end of the year. Last year alone eBay did $22 billion in mobile commerce volume. To help get a 360 degree view of the opportunities in mobile, the good folks over at Surge Media have put together a very useful infographic.